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タイトル: | Petrogenesis of isotopically enriched Quaternary magma with adakitic affinity associated with subduction of old lithosphere beneath central Myanmar |
著者: | Sano, Takashi Tani, Kenichiro Yoneda, Shigekazu Min, Hla Htike, Thaung Maung Thein, Zin Maung Ishizuka, Osamu Kusuhashi, Nao Kono, Reiko T. Takai, Masanaru Conway, Chris E. |
著者名の別形: | 佐野, 貴司 谷, 健一郎 米田, 成一 石塚, 治 楠橋, 直 河野, 礼子 高井, 正成 |
キーワード: | Geochemistry Petrology Volcanology |
発行日: | 2022 |
出版者: | Springer Nature |
誌名: | Scientific Reports |
巻: | 12 |
論文番号: | 3137 |
抄録: | We present a model for the petrogenesis of magma with adakitic affinity in an old subduction zone, which does not involve slab melting and is constrained by new geochronological and geochemical data for Mt. Popa, the largest of three Quaternary volcanoes in central Myanmar (Popa, Monywa and Singu). The edifice is composed of Popa Plateau (0.8–0.6 Ma) with high-K rocks and a stratovolcano (< 0.33 Ma) predominantly composed of medium-K rocks with adakitic affinity (Mg# 45–63, Sr/Y > 40). The distinct K contents indicate that the adakitic magmas cannot be derived from Popa high-K rocks, but they share trace-element signatures and Sr–Nd isotope ratios with medium-K basalts from Monywa volcano. Our estimation of water contents in Popa magma reveals that primary magma for medium-K basalts was generated by partial melting of wedge mantle with normal potential temperature (TP 1330–1340 °C) under wet conditions (H₂O 0.25–0.54 wt%). Its melting was probably induced by asthenospheric upwelling that is recognized by tomographic images. Mafic adakitic magma (Mg# ~ 63, Sr/Y ~ 64) was derived from the medium-K basaltic magma in fractional crystallization of a garnet-bearing assemblage at high pressure, and felsic adakitic rocks (Mg# ~ 45, Sr/Y ~ 50) were produced by assimilation-fractional crystallization processes at mid-crustal depths. |
記述: | ミャンマーの活火山のマグマ生成メカニズムを解明 --今後も噴火する可能性の高い活火山であることが判明--. 京都大学プレスリリース. 2022-03-10. |
著作権等: | © The Author(s) 2022 This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holde |
URI: | http://hdl.handle.net/2433/268795 |
DOI(出版社版): | 10.1038/s41598-022-07097-4 |
PubMed ID: | 35210521 |
関連リンク: | https://www.kyoto-u.ac.jp/ja/research-news/2022-03-10-0 |
出現コレクション: | 学術雑誌掲載論文等 |
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